EP1864335A1 - Detecteur optique integre dans reflecteur a semi-conducteurs - Google Patents

Detecteur optique integre dans reflecteur a semi-conducteurs

Info

Publication number
EP1864335A1
EP1864335A1 EP06739740A EP06739740A EP1864335A1 EP 1864335 A1 EP1864335 A1 EP 1864335A1 EP 06739740 A EP06739740 A EP 06739740A EP 06739740 A EP06739740 A EP 06739740A EP 1864335 A1 EP1864335 A1 EP 1864335A1
Authority
EP
European Patent Office
Prior art keywords
optical
semiconductor material
reflective surface
optical beam
photodetector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06739740A
Other languages
German (de)
English (en)
Other versions
EP1864335B1 (fr
Inventor
Andrew Alduino
Mario Paniccia
Rami Cohen
Assia Barkai
Ansheng Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intel Corp
Original Assignee
Intel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Intel Corp filed Critical Intel Corp
Publication of EP1864335A1 publication Critical patent/EP1864335A1/fr
Application granted granted Critical
Publication of EP1864335B1 publication Critical patent/EP1864335B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4246—Bidirectionally operating package structures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B2006/12083—Constructional arrangements
    • G02B2006/12104—Mirror; Reflectors or the like

Definitions

  • the present invention relates generally to optical devices and, more specifically, the present invention relates to optical detectors.
  • Copper based electrical interconnects are commonly used when connecting electrical devices over short distances because copper based electrical interconnects are simple, cheap, well understood and reliable.
  • PCB printed circuit boards
  • EMI electromagnetic interference
  • Lasers are well known devices that emit light through stimulated emission and produce coherent light beams with a frequency spectrum ranging from infrared to ultraviolet and may be used in a vast array of applications.
  • semiconductor lasers may be used to produce light or optical beams on which data or other information may be encoded and transmitted.
  • Figure 1 is a diagram illustrating a cross-section of one embodiment of a coupling device including an integrated optical detector in accordance with the teachings of the present invention.
  • Figure 2 is a diagram illustrating a cross-section of another embodiment of a coupling device including an integrated optical detector in accordance with the teachings of the present invention.
  • Figure 3 is a diagram illustrating an embodiment of an optical source optically coupled to an optical fiber via various embodiments of reflectors including an integrated optical detector in accordance with the teachings of the present invention.
  • Figure 4 is a diagram illustrating an embodiment of an optical detector monolithically integrated in and/ or around an optical reflector defined in a semiconductor material in accordance with the teachings of the present invention.
  • Figure 5 is a diagram illustrating another embodiment of an optical detector monolithically integrated in and/ or around an optical reflector defined in semiconductor material in accordance with the teachings of the present invention.
  • Figure 6 is a diagram illustrating a cross-section illustration of an optical detector monolithically integrated in and/ or around an optical reflector defined in a semiconductor material in accordance with the teachings of the present invention.
  • FIG. 1 is a diagram that shows a cross-section of one embodiment of a coupling device 101 including an embodiment of an optical detector 155 monolithically integrated in and/or around an optical reflector 107 in accordance with the teachings of the present invention.
  • coupling device 101 includes a first trench 105 that is defined in semiconductor material 103.
  • semiconductor material 103 is a silicon semiconductor substrate which may be packaged with a C4 ball grid array or the like.
  • optical reflector 107 is defined at a first end of the first trench 105 in semiconductor material 103.
  • the optical reflector 107 is angled with respect to an axis of the first trench 105.
  • optical reflector 107 is shown to be illustrated at approximately 45 degrees with respect to the axis of first trench 105 such that optical reflector 107 reflects or redirects an incident optical beam in accordance with the teachings of the present invention.
  • first trench 105 is a trench or groove that is etched or defined in semiconductor material 103 as for example a V-groove, U-groove, or the like such that the first end 157 of optical fiber 109 is passively aligned in trench 105 when optical fiber 109 is disposed or received in trench 105.
  • an optical source 111 is mounted to semiconductor material 103 and/ or is located proximate to optical reflector 107 in the first trench 105.
  • optical source 111 is includes a laser, such as for example a vertical cavity surface-emitting lasers (VCSEL) or other suitable optical source.
  • VCSEL vertical cavity surface-emitting lasers
  • optical source 111 outputs an optical beam 113 such that the first end 157 of optical fiber 109 is an optical destination of optical beam 113 directed from optical source 111 and reflected from optical reflector 107 according to an embodiment of the present invention.
  • optical source 111 may be one of a plurality or an array of optical sources and may output one or more optical beams
  • a plurality of trenches 105 are defined in semiconductor material 103, a corresponding optical fiber 109 is disposed in each respective trench 105 and a corresponding optical source 111 is disposed proximate to a corresponding trench 105 such that an optical beam 113 is transmitted through each respective optical fiber 109.
  • optical detector 155 is included in semiconductor material 103 in accordance with the teachings of the present invention.
  • optical detector 155 is an active device that is monolithically integrated during fabrication in the optical reflector 107 of semiconductor 103 to detect optical beam 113. Detection of optical beam 113 using an embodiment of optical detector 155 enables functions such as optical power monitoring of optical beam 113 or for example measuring the extinction ratio of optical beam 113 in accordance with the teachings of the present invention.
  • a plurality of respective optical detectors 155 may be monolithically integrated in optical reflector 107 to individually detect, monitor or measure the respective optical beam 113 in accordance with the teachings of the present invention. Individual detection and monitoring of each optical beam 113, allows for individual control of the driving currents to compensate for device non-uniformity, temperature variation, lifetime variation, etc. in accordance with the teachings of the present invention.
  • PCB printed circuit board
  • PCB is made of a glass fiber epoxy laminate such as for example an FR4 material or other suitable material.
  • PCB 115 includes contacts 117 which are electrically coupled to semiconductor material 103.
  • contacts 117 are electrically coupled to semiconductor material 103 through conductors 121 and solder bumps 123 or other suitable electrical connections.
  • contacts 117 are arranged on PCB 115 so as to provide an edge connector, which in one embodiment is coupled to receive or transmit an electrical signal 119.
  • coupling device 101 further includes a circuit 125 included in semiconductor material 127, which in one embodiment is a silicon semiconductor substrate mounted to semiconductor material 103. As shown in the depicted embodiment, circuit 125 is electrically coupled to optical source 111, optical detector 155 and PCB 115 through conductors 129 and contacts 131. In one embodiment, circuit 125 includes circuitry such as for example complementary metal oxide semiconductor (CMOS) drivers and/ or control circuitry to monitor optical detector 155 and drive and/ or control optical source 111 accordingly.
  • CMOS complementary metal oxide semiconductor
  • circuit 125 is coupled to receive electrical signal 119 and aid optical source 111 in performing an electrical-optical conversion from electrical signal 119 to the appropriate power levels of optical beam 113. In one embodiment, circuit 125 also monitors with optical detector 155 the power or extinction ratio of optical beam 113 reflected from optical reflector 107 and controls optical beam 113 in response. In so doing, optical source 111 outputs optical beam 113 in response to electrical signal 119 and/ or feedback received from optical detector 155 regarding monitored optical beam 113. In one embodiment optical beam 113 is directed from optical source 111 to reflector 107, which is defined in semiconductor material 103 at end of trench 105.
  • Optical beam 113 is then directed from reflector 107 to an optical target, which is illustrated in Figure 1 as the first end 157 of optical fiber 109.
  • an optical receiver 153 is optically coupled to the other end 159 of optical fiber 109 to receive optical beam 113.
  • coupling device 101 is illustrated in the example embodiment of Figure 1 with one optical source 111, one trench 105 and one optical fiber 109, it is appreciated that in another embodiment, a plurality of corresponding optical sources 111, optical detectors 155, trenches 105 and optical fibers 109 may be included in coupling device 101.
  • the monolithically integrated optical detectors 155 in optical reflectors 107 can individually detect, monitor or measure each respective optical beam 113 in accordance with the teachings of the present invention. Individual detection and monitoring of each optical beam 113, allows for individual control of the driving currents to compensate for device non-uniformity, temperature variation, lifetime variation, etc. in accordance with the teachings of the present invention.
  • FIG 2 is a diagram illustrating a cross-section of another embodiment of a coupling device 201 in accordance with the teachings of the present invention.
  • the embodiment of coupling device 201 illustrated in Figure 2 shares similarities to the embodiment of coupling device 101 illustrated in Figure 1.
  • coupling device 201 includes first trench 105 defined in semiconductor material 103.
  • First reflector 107 is defined in first trench 105 in semiconductor material 103.
  • First optical fiber 109 is disposed in first trench 105.
  • optical fiber 109 is passively aligned in trench 105 when optical fiber 109 is disposed or received in trench 105.
  • optical source 111 is mounted to semiconductor material 103 such that the optical source 111 is optically coupled to first optical fiber 109 via the first reflector 107. In one embodiment, optical source 111 outputs optical beam 113 to optical fiber 109 via reflector 107. In another embodiment, optical source 111 may be one of a plurality or an array of optical sources and may output one or more optical beams. In yet another embodiment, a plurality of trenches 105 are defined in semiconductor material 103, a corresponding optical fiber 109 is disposed in each respective trench 105 and a corresponding optical source 111 is disposed proximate to a corresponding trench 105 such that an optical beam 109 is transmitted through each respective optical fiber 109. As shown in the depicted embodiment of Figure 2, an optical detector 155 is included in semiconductor material 103 and is an active device that is monolithically integrated during fabrication in the optical reflector 107 of semiconductor 103 to detect optical beam 113.
  • semiconductor material 103 is mounted on a PCB 115.
  • PCB 115 includes contacts 117 which are electrically coupled to semiconductor material 103 through conductors 121 and solder bumps 123.
  • contacts 117 provide a connector, which in one embodiment is coupled to receive and/ or transmit electrical signal 119.
  • coupling device 201 further includes a circuit 225, which is included semiconductor material 103.
  • circuit 225 is monolithically integrated directly into the same semiconductor material that includes monolithically integrated optical detector 155 in accordance with the teachings of the present invention. As shown in the embodiment shown in Figure 2, circuit 225 is electrically coupled between optical source 111 and PCB 115 through conductors 129 and contacts 123.
  • circuit 225 includes circuitry to drive and/or control optical device 211 in response to electrical signal 119 and/ or feedback received from optical detector 155.
  • Figure 3 is a diagram illustrating an embodiment of an optical source 311 optically coupled to an optical fiber 309 via a reflector 307 or 308 including a monolithically integrated optical receiver 355 in greater detail accordance with the teachings of the present invention.
  • trench 305 is implanted in semiconductor material 303.
  • a reflector 307 which is substantially planar, is defined at the end of trench 305.
  • a reflector 308, which has a curvature or is non-planar is defined at the first end of trench 305.
  • a reflective material such as for example a metalization and/ or other suitable material, is patterned on reflector 307 or 308 to improve the reflectivity of reflector 307 or 308.
  • an optical fiber 309 is disposed in trench 305 at a second end of trench 305.
  • trench 305 is defined in semiconductor material 303 such that optical fiber 309 is passively aligned with trench 305 when optical fiber 309 is disposed in trench 309.
  • an optical source 311 such as for example a VCSEL, directs optical beam 313 to reflector 307 or 308, which is then directed from reflector 307 or 308 to an optical target 357, which is an end of optical fiber 309.
  • optical detector 355 is monolithically integrated in the optical reflector 307 or 308 of semiconductor 303 to detect and/ or monitor optical beam 313.
  • the optical beams 313 and/or 314 that are reflected from reflectors 307 and/or 308, respectively, are directed into optical fiber 309 in accordance with the teachings of the present invention.
  • the non-planar shape of reflector 308 helps to focus more of optical beam 314 into the optical target located at the end 357 of optical fiber 309 to reduce optical coupling loss in accordance with the teachings of the present invention.
  • optical beam 313 is illustrated as being directed through trench 305 through free space.
  • trench 305 may optionally include one or more of a lens and/ or a waveguide and/ or other suitable optical elements to optically couple optical source 311 and optical fiber 309.
  • Figure 4 is a diagram illustrating an embodiment of an optical detector monolithically integrated in an optical reflector 407 defined in semiconductor material in accordance with the teachings of the present invention.
  • optical reflector 407 is shown as having a V-shape due to the V-groove formed by the trench in the semiconductor material.
  • optical detector 455 includes a photodetector that includes a P- type doped region 461 and an N-type doped region 463 defined in semiconductor material having high resistivity in accordance with the teachings of the present invention.
  • Contacts 469 are shown as being electrically coupled to P-type doped regions 461 and contacts 471 are shown as being electrically coupled to N-type doped regions 463.
  • contacts 469 and 471 are electrically coupled to for example conductors 129 in Figures 1 and 2 and provide coupling to circuit 125 or 225 in accordance with the teachings of the present invention.
  • the P-type and N-type doped regions 461 and 463 are located in an absorbing region 467 arranged in an outer region around a central region of the photodetector.
  • the photodetector is illuminated with incident optical beam 413 such that the central region is towards the center of the spot of optical beam 413 while the absorbing region is located towards the outer regions of the spot of optical beam 413 reflected from optical reflector 407.
  • the central region of the photodetector includes a reflective material 465, which may include for example sputtered gold or another suitably reflective material.
  • the reflective properties of the central portion including reflective material 465 help to provide low loss optical coupling from the optical source 111 into the optical fiber 109, while the outer absorbing regions 467 incorporate the detector function of optical detector 455 in accordance with the teachings of the present invention. It is noted that in other embodiments, various and other orientations and arrangements of the p-type and n-type absorbing regions, as well as the reflector and electrodes, are possible in accordance with the teachings of the present invention. Depending upon the characteristics of the embodiment, the optical intensity profile of optical beam 413 might be even more desirable than that shown in the example in Figure 4 in accordance with the teachings of the present invention.
  • Figure 5 is a diagram illustrating another embodiment of an optical detector 555 monolithically integrated in an optical reflector 507 defined in semiconductor material in accordance with the teachings of the present invention.
  • optical detector 555 includes a photodetector that includes a metal-semiconductor-metal (MSM) type photodetector.
  • MSM metal-semiconductor-metal
  • the photodetector includes a central metal region 573 surrounded by an outer metal region 575 disposed in the semiconductor material of optical detector 555 in accordance with the teachings of the present invention.
  • Contacts 569 and 571 are shown as being electrically coupled to the metal regions 573 and 575 to provide electrical coupling to for example conductors 129 in Figures 1 and 2 to provide coupling to circuit 125 or 225 in accordance with the teachings of the present invention.
  • metal 573 and metal 575 are made of Ti/ Au or other materials which provide a Schottky barrier between metal and semiconductor.
  • the photodetector is illuminated with incident optical beam 513 such that the central metal region 573 is towards the center of the spot of optical beam 513 while the outer metal region 575 is located towards the outer regions of the spot of optical beam 513 reflected from optical reflector 507.
  • the metal regions 573 and 575 of the photodetector are reflective to help to provide low loss optical coupling from the optical source 111 into the optical fiber 109 in accordance with the teachings of the present invention. It is noted that in other embodiments, various and other orientations and arrangements of the p-type and n-type absorbing regions, as well as the reflector and electrodes, are possible in accordance with the teachings of the present invention. Depending upon the characteristics of the embodiment, the optical intensity profile of optical beam 513 might be even more desirable than that shown in the example in Figure 5 in accordance with the teachings of the present invention.
  • Figure 6 is a diagram illustrating a cross-section illustration of yet another embodiment of an optical detector 655 including a photodetector monolithically integrated in an optical reflector 607 defined in semiconductor material 603 in accordance with the teachings of the present invention.
  • a P-type doped region 661 is disposed in a central region of the photodetector surrounded by an N-type doped region 663 defined towards outer regions of the photodetector.
  • N-type doped region 663 may be a single doped region or multiple doped regions defined in high resistivity semiconductor material in a ring arrangement surrounding P-type doped region 661.
  • a reflector material 665 is illustrated as being patterned over the central region of the photodetector on the reflective surface of the optical reflector 607. Accordingly, incident optical beam 613 is reflected from the reflective surface of the optical reflector 607 while optical beam 613 is detected and/ or monitored by the photodetector in accordance with the teachings of the present invention.
  • the polarity of the P-type and N- type doped regions 661 and 663 may be reversed in accordance with the teachings of the present invention.
  • the P-type and N-type doped regions 661 and 663 are separated in the semiconductor material 603 by a distance of X.
  • the photo absorption depth of optical beam 613 is illustrated as Y and the electric field between the P-type and N-type doped regions 661 and 663 is illustrated as E in Figure 6.
  • the speed of optical detector 655 is determined or influenced by factors including X and Y.
  • X is approximately 20 ⁇ m and Y is approximately 850 nm in accordance with the teachings of the present invention.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Semiconductor Lasers (AREA)
  • Light Receiving Elements (AREA)

Abstract

L'invention porte sur un coupleur et un détecteur électro-optique. L'appareil de cette invention comprend une surface réfléchissante formée sur un matériau semi-conducteur. La surface réfléchissante doit renvoyer un faisceau optique incident vers une destination optique. Un détecteur optique est intégré monolithiquement dans la surface réfléchissante du matériaux semi-conducteur. Le détecteur optique disposé dans la surface réfléchissante du matériau semi-conducteur doit détecter le faisceau optique incident.
EP06739740.6A 2005-03-28 2006-03-24 Detecteur optique integre dans reflecteur a semi-conducteurs Active EP1864335B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/092,059 US7782921B2 (en) 2005-03-28 2005-03-28 Integrated optical detector in semiconductor reflector
PCT/US2006/011132 WO2006105030A1 (fr) 2005-03-28 2006-03-24 Detecteur optique integre dans reflecteur a semi-conducteurs

Publications (2)

Publication Number Publication Date
EP1864335A1 true EP1864335A1 (fr) 2007-12-12
EP1864335B1 EP1864335B1 (fr) 2013-09-04

Family

ID=36649544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06739740.6A Active EP1864335B1 (fr) 2005-03-28 2006-03-24 Detecteur optique integre dans reflecteur a semi-conducteurs

Country Status (5)

Country Link
US (1) US7782921B2 (fr)
EP (1) EP1864335B1 (fr)
JP (1) JP4902637B2 (fr)
TW (1) TWI334498B (fr)
WO (1) WO2006105030A1 (fr)

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US7306378B2 (en) 2004-05-06 2007-12-11 Intel Corporation Method and apparatus providing an electrical-optical coupler
US7782921B2 (en) 2005-03-28 2010-08-24 Intel Corporation Integrated optical detector in semiconductor reflector
KR101682269B1 (ko) * 2013-09-25 2016-12-05 주식회사 엘지화학 레이저 커팅 장치 및 그 커팅 방법
US20220216667A1 (en) * 2019-09-30 2022-07-07 Ultra Communications, Inc. Circuit substrate light coupler

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Also Published As

Publication number Publication date
WO2006105030A1 (fr) 2006-10-05
TWI334498B (en) 2010-12-11
JP2008535259A (ja) 2008-08-28
US20060215726A1 (en) 2006-09-28
EP1864335B1 (fr) 2013-09-04
TW200641426A (en) 2006-12-01
JP4902637B2 (ja) 2012-03-21
US7782921B2 (en) 2010-08-24

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